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Fisher & Paykel -
900HC439
These Diffuser Filters are for use with the Diffuser Elbow available for all FlexiFit 405 (HC405), FlexiFit 406 (HC406), and FlexiFit (HC407) Nasal CPAP and BiPAP masks, and all Oracle (HC451 & HC452) Oral CPAP & BiPAP Masks.